68 PROTOZOIC ROCKS 
About the upper part of Lake Pepin, and north of it, the land les generally level, 
at least sufficiently so for all agricultural purposes, except in the immediate vicinity 
of the streams, where the ground is often broken and abrupt. From Lake Pepin 
south, to the Upper Iowa, the surface is rather more broken; those portions, how- 
ever, which are too uneven for other farming purposes, will afford a pastoral region 
of great capabilities, leaving little to be desired by the shepherd and stock farmer 
but a greater proportion of timber. From the base of the cliffs there often rise 
copious springs, cool and clear; these not unfrequently give rise to small streams, 
which furnish abundance of delicious trout. The rivers are well stocked with bass, 
carp, sunfish, pickerel, pike, and catfish. The prairies abound in game, especially 
deer, grouse, pheasants, and partridges; wild geese and ducks frequent the streams 
in immense flocks. The elevated lands would furnish high, dry pasture-ground for 
sheep, and the valleys and bottoms grain and hay for winter fodder. 
CLIFFS OF LOWER MAGNESIAN LIMESTONE, UPPER IOWA RIVER. 
SECTION V. 
ITS RANGE, EXTENT AND BEARING. 
THE area occupied by the Lower Magnesian Limestone lies southwest of that 
covered by Formation 1; forming a belt, with an average width of forty miles, and 
through which the Mississippi flows, nearly centrally. It is coloured on the Chart 
